Finding the Third Proportional to 317,493 and 660,865.50

Step by Step Solution

1. Step 1: Write the proportion equation
   317,493 : 660,865.50 = 660,865.50 : x
2. Step 2: Convert to fraction form
   317,493/660,865.50 = 660,865.50/x
3. Step 3: Cross multiply
   317,493x = 660,865.50 × 660,865.50
4. Step 4: Simplify right side
   317,493x = 436,743,209,090.25
5. Step 5: Solve for x
   x = 436,743,209,090.25/317,493
6. Step 6: Final answer
   x = 1,375,599.49